On Fri 15.Jul'16 at 3:26:03 +0100, Al Viro wrote:
On Fri, Jul 15, 2016 at 10:22:04AM +0800, Liu Shuo wrote:
> You have no warranty whatsoever that descriptor table has not been changed
> by that point. You should *NEVER* use sys_close() on failure exit paths
Could you please elaborate why we're not sure descriptor table's changing at the point?
Because that could be called by one thread while another (having guessed the
descriptor you are about to get) does close()/dup2()/etc.
If there is no such thread (who operates the descriptor based on
guessing), i can think the changing is safe at the point. As the fd has
not been delivered to userspace. Am i right?
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